1. F. Abele’s Ed.,“Optical Properties of Solids”, North-Holland Publ. Comp., Amsterdam (1972).
2. M. Born and E. Wolf, “Principles of Optics”,3rd ed., Pergamon Press, Oxford (1965).
3. O.S. Heavens, “Optical Properties of Thin Solid Films”, Academic Press, New York (1955).
4. R. E. Hummel, “Optische Eigenschaften von Metallen und Legierungen”, Springer-Verlag Berlin, Heidelberg, New York, (1971).
5. R. E. Hummel, “Electronic Properties of Materials”, Springer Verlag Berlin, Heidelberg, New York, (1985).